Astro Corner
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Celestial object
C/1999 U4 (Catalina-Skiff)
1999 U4, C/1999 U4 (Catalina-Skiff), Catalina-Skiff
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Reference data
RADate-dependentMoving object · use an ephemeris
DecDate-dependentMoving object · use an ephemeris
Magnitude—
Angular size—
Position angle—
Distance—
Constellation—
Solar System catalogue
JPL SBDBMoving-object reference
Comets and minor planets move against the background sky. Astro Corner therefore keeps their orbital catalogue record separately and does not pretend a single RA/Dec is permanently correct.
Primary designation1999 U4
JPL SPK-ID1000282
Orbit classHYP
Orbit IDJPL 64
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2452275.5
Eccentricity1.007569462743
Semi-major axis-649.365762719 AU
Perihelion distance4.915349948 AU
Orbital period—
Earth MOID4.336280000 AU
Jupiter Tisserand—
Inclination51.92599071°
Absolute magnitude · H—
Comet total magnitude · M110.3000 · K1 4.5000
Diameter—
Albedo—
Last catalogue sync2026-09-18 08:00:02
Planning coordinates are intentionally separate.A later Horizons ephemeris layer can calculate the object's apparent position for a specific date, time and observing location. Until then, static-sky tools are hidden for this record rather than showing misleading coordinates.
Open JPL Small-Body Database 
Reference transparencySources & data provenanceSee where catalogue identities and imported reference fields came from.4 records
Community observations
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Images of this object
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